Unfortunately, when it comes to studying for the DAT you don't really have much of an option. You should be using
Cliffs AP Bio 3rd edition (really easy to read) and
Feralis biology notes to study biology. For GChem, OChem and Math you should use
Chad's videos. Then use
DAT Bootcamp generators and CrackDATPAT to practice for the PAT.
Once you're done reviewing all the material you can begin using DAT destroyer and do practice problems for Bio, GChem, OChem and Math. I recommend going over this book at least 2-3 times and understanding why you got each answer right or wrong. Also, I would recommend looking for flash cards on Quizlet for reviewing the bio chapters. Simply type in Quizlet Cliffs AP Bio Chapter 1,2,3... in google and you'll find them. You can even download the quizlet app on your phone. Also Chad's quizzes are good for bio although some of the answers may not be 100% correct. This
site has some good flashcards as well to help you memorize.
Anyways, I would recommend studying 1-2 subjects a day and throwing in 30 minute intervals of PAT practice.
ex. Study for 1-2 hours -> 15 min break -> 30 mins of angle ranking -> Study 1-2 hours and repeat.
btw, you should use the woodgears game to become better at angle ranking. do it as much as you can every day. the link is found
here.
If you really hate reading books than you can even watch Chad's biology videos and take very good notes. If your not a fan of Chad (I don't see why you wouldn't be) then I would recommend using
Craig Savage's videos on Youtube.
Best of luck.